package com.yl.common.utils;

import java.security.KeyFactory;
import java.security.Signature;
import java.security.spec.X509EncodedKeySpec;
import java.util.Collection;
import java.util.List;
import java.util.stream.Collectors;

import org.apache.commons.codec.binary.Base64;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
import org.springframework.util.PatternMatchUtils;
import com.yl.common.constant.Constants;
import com.yl.common.constant.HttpStatus;
import com.yl.common.core.domain.entity.SysRole;
import com.yl.common.core.domain.model.LoginUser;
import com.yl.common.exception.ServiceException;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

/**
 * 安全服务工具类
 *
 * @author wssl
 */
public class SecurityUtils
{

    /**
     * 用户ID
     **/
    public static Long getUserId()
    {
        try
        {
            return getLoginUser().getUserId();
        }
        catch (Exception e)
        {
            throw new ServiceException(HttpStatus.UNAUTHORIZED,"获取用户ID异常");
        }
    }

    /**
     * 获取部门ID
     **/
    public static Long getDeptId()
    {
        try
        {
            return getLoginUser().getDeptId();
        }
        catch (Exception e)
        {
            throw new ServiceException(HttpStatus.UNAUTHORIZED,"获取部门ID异常");
        }
    }

    /**
     * 获取用户账户
     **/
    public static String getUsername()
    {
        try
        {
            return getLoginUser().getUsername();
        }
        catch (Exception e)
        {
            throw new ServiceException(HttpStatus.UNAUTHORIZED,"获取用户账户异常");
        }
    }

    /**
     * 获取用户
     **/
    public static LoginUser getLoginUser()
    {
        try
        {
            return (LoginUser) getAuthentication().getPrincipal();
        }
        catch (Exception e)
        {
            throw new ServiceException(HttpStatus.UNAUTHORIZED,"获取用户信息异常");
        }
    }

    /**
     * 获取Authentication
     */
    public static Authentication getAuthentication()
    {
        return SecurityContextHolder.getContext().getAuthentication();
    }

    /**
     * 生成BCryptPasswordEncoder密码
     *
     * @param password 密码
     * @return 加密字符串
     */
    public static String encryptPassword(String password)
    {
        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
        return passwordEncoder.encode(password);
    }

    /**
     * 判断密码是否相同
     *
     * @param rawPassword 真实密码
     * @param encodedPassword 加密后字符
     * @return 结果
     */
    public static boolean matchesPassword(String rawPassword, String encodedPassword)
    {
        BCryptPasswordEncoder passwordEncoder = new BCryptPasswordEncoder();
        return passwordEncoder.matches(rawPassword, encodedPassword);
    }

    /**
     * 是否为管理员
     *
     * @param userId 用户ID
     * @return 结果
     */
    public static boolean isAdmin(Long userId)
    {
        return userId != null && 1L == userId;
    }

    /**
     * 验证用户是否具备某权限
     *
     * @param permission 权限字符串
     * @return 用户是否具备某权限
     */
    public static boolean hasPermi(String permission)
    {
        return hasPermi(getLoginUser().getPermissions(), permission);
    }

    /**
     * 判断是否包含权限
     *
     * @param authorities 权限列表
     * @param permission 权限字符串
     * @return 用户是否具备某权限
     */
    public static boolean hasPermi(Collection<String> authorities, String permission)
    {
        return authorities.stream().filter(StringUtils::hasText)
                .anyMatch(x -> Constants.ALL_PERMISSION.equals(x) || PatternMatchUtils.simpleMatch(x, permission));
    }

    /**
     * 验证用户是否拥有某个角色
     *
     * @param role 角色标识
     * @return 用户是否具备某角色
     */
    public static boolean hasRole(String role)
    {
        List<SysRole> roleList = getLoginUser().getUser().getRoles();
        Collection<String> roles = roleList.stream().map(SysRole::getRoleKey).collect(Collectors.toSet());
        return hasRole(roles, role);
    }

    /**
     * 判断是否包含角色
     *
     * @param roles 角色列表
     * @param role 角色
     * @return 用户是否具备某角色权限
     */
    public static boolean hasRole(Collection<String> roles, String role)
    {
        return roles.stream().filter(StringUtils::hasText)
                .anyMatch(x -> Constants.SUPER_ADMIN.equals(x) || PatternMatchUtils.simpleMatch(x, role));
    }

    /**
     * 签名验证  确认请求来源
     */
    public static boolean verify(String data, String signature, String publicKey){
        boolean verify = false;
        try {
            X509EncodedKeySpec keySpec = new X509EncodedKeySpec(new Base64().decode(publicKey));
            KeyFactory keyFactory= KeyFactory.getInstance( "RSA");
            Signature verifier =Signature.getInstance("SHA256withRSA");
            verifier.initVerify(keyFactory.generatePublic(keySpec));
            verifier.update(data.getBytes());
            verify = verifier.verify(new Base64().decode(signature));
        } catch (Exception e) {
            e.printStackTrace();
        }
        return verify;
    }

    /**
     * 数据解密
     */
    public static String decryptAES(String encryptedText, String key){
        String str = "";
        try {
            SecretKey secretKey = new SecretKeySpec(key.getBytes(),"AES");
            Cipher cipher=Cipher.getInstance( "AES");
            cipher.init(cipher.DECRYPT_MODE,secretKey);
            byte[] decryptedBytes = cipher.doFinal(new Base64().decode(encryptedText));
            str =  new String(decryptedBytes);
        } catch (Exception e) {
            e.printStackTrace();
        }
        return str;
    }












}
